Blower works no heat

I have a 2005 saab linear at one point the ac did not blow cold so I recharged the system and since then yhe heat doesn't work anylonger. Yhe blower works with no problem the engine temp stays at normal temperature. The outside temp sensor works reading correct temp.
All commands on the manual ac control panel seem to be working fine. I would have tried a calibration but all instructions I found are to press ac and auto.. The manual panel does not have an auto button. I forgot to mention that both hoses going in and out of the heater core are hot so the core is not plugged. Any suggestions?